Hindlimb biomechanics of Lagosuchus talampayensis (Archosauria, Dinosauriformes), with comments on skeletal morphology DOI Creative Commons
Alejandro Otero, Peter J. Bishop, John R. Hutchinson

et al.

Journal of Anatomy, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 4, 2024

Abstract Lagosuchus talampayensis is a small‐bodied (~0.5 m long) Late Triassic dinosauriform archosaur from Argentina. long has been pivotal taxon for reconstructing the evolution of form and function on dinosaur lineage. This importance because it mix ancestral archosaurian traits, such as small pelvis with mostly closed acetabulum lacking prominences that would restrict hip mobility much, derived “dinosaurian” traits bipedalism, proximally shifted thigh muscle insertions, elongate hindlimbs, “advanced mesotarsal” ankle joints digitigrade feet. Here, to quantify key functional related locomotor biomechanics , we build three‐dimensional musculoskeletal model, focussing morphofunctional analysis pelvic limb. We survey skeletal material have digitised, pointing out hitherto undescribed features elements, many which are taxa other than . Next, select ideal elements amongst these construct composite articulate adjacent body segments into joints, then estimate shape including centre mass, add paths create model. Finally, use two methods hindlimb parameters (“architecture”) in find they produce similar estimates force‐generating capacities, compare data few available archosaurs an evolutionary context, reconstruct fundamental patterns changes architecture limb morphology. Our model forms valuable basis future quantitative analyses its early archosaurs, example how navigate decision‐making modelling problematic specimens.

Language: Английский

Locomotion and the early Mesozoic success of Archosauromorpha DOI Creative Commons
Amy Shipley, Armin Elsler, Suresh A. Singh

et al.

Royal Society Open Science, Journal Year: 2024, Volume and Issue: 11(2)

Published: Feb. 1, 2024

The Triassic was a time of ecological upheaval as life recovered from the Permian-Triassic mass extinction. Archosauromorphs were key component recovery, diversifying substantially during and encompassing origins dinosaurs, pterosaurs crocodylomorphs. Here, we explore evolution locomotion in Archosauromorpha to test whether dinosaurs show any distinctive locomotory features that might explain their success. We implement geometric morphometrics on limb bone shapes use ratios calculate bipedality cursoriality metrics. find Avemetatarsalia (dinosaurs, relatives) exhibit more variable form than other group, indicating wider range modes. earliest avemetatarsalians bipedal cursorial, increased through with notable diversification shifts following extinction events. This is especially true even though these changes cannot be discriminated stochastic process. By contrast, Pseudosuchia (crocodilians restricted locomotor mode disparity decreasing time, suggesting limited adaptation vulnerability Perhaps greater plasticity gave them competitive advantage changing climates Late Triassic.

Language: Английский

Citations

4
Cladistic estimates of evolutionary rates focused on palaeontological datasets using TNT DOI Open Access
Diego Pol, Martín D. Ezcurra

Cladistics, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 30, 2025

Abstract We describe a protocol for estimating evolutionary rates from phylogenetic trees based on parsimony character optimization. The rate estimation is conducted through TNT script and the results are analysed in software environment R. allows analysing multiple optimal topologies, considering optimization ambiguity, alternative time‐calibrations or pre‐calibrated trees. R summarizes estimated consensus tree plots variation of time, jointly with diversity new metric (clade completeness index) that measures distribution missing data along tree. present simulated empirical analyses, evaluate impact calibration methods estimates. found while can lower nominal values rates, overall pattern time remained robust. Empirical cases highlight different scenarios, such as datasets which peaks be coupled decoupled diversification dynamics (phylogenetic diversity) may influence rates. conclude recommendations using this interpreting parsimony‐based

Language: Английский

Citations

0
Triassic climate and the rise of the dinosaur empire in South America DOI
Leonardo Corecco, Matthew J. Kohn, César Leandro Schultz

et al.

Journal of South American Earth Sciences, Journal Year: 2024, Volume and Issue: 142, P. 104977 - 104977

Published: June 5, 2024

Language: Английский

Citations

1
Hindlimb biomechanics of Lagosuchus talampayensis (Archosauria, Dinosauriformes), with comments on skeletal morphology DOI Creative Commons
Alejandro Otero, Peter J. Bishop, John R. Hutchinson

et al.

Journal of Anatomy, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 4, 2024

Abstract Lagosuchus talampayensis is a small‐bodied (~0.5 m long) Late Triassic dinosauriform archosaur from Argentina. long has been pivotal taxon for reconstructing the evolution of form and function on dinosaur lineage. This importance because it mix ancestral archosaurian traits, such as small pelvis with mostly closed acetabulum lacking prominences that would restrict hip mobility much, derived “dinosaurian” traits bipedalism, proximally shifted thigh muscle insertions, elongate hindlimbs, “advanced mesotarsal” ankle joints digitigrade feet. Here, to quantify key functional related locomotor biomechanics , we build three‐dimensional musculoskeletal model, focussing morphofunctional analysis pelvic limb. We survey skeletal material have digitised, pointing out hitherto undescribed features elements, many which are taxa other than . Next, select ideal elements amongst these construct composite articulate adjacent body segments into joints, then estimate shape including centre mass, add paths create model. Finally, use two methods hindlimb parameters (“architecture”) in find they produce similar estimates force‐generating capacities, compare data few available archosaurs an evolutionary context, reconstruct fundamental patterns changes architecture limb morphology. Our model forms valuable basis future quantitative analyses its early archosaurs, example how navigate decision‐making modelling problematic specimens.

Language: Английский

Citations

0